Airbag control unit with part number 89170-12K50

What does the airbag control unit 89170-12K50 do?

The control unit 89170-12K50 coordinates the restraint system (SRS) of Toyota. It reads the crash sensors, decides in an accident which airbags and seatbelt pretensioners fire, and reports faults to the airbag warning light.

The evaluation runs in the background within fractions of a second, while the unit also checks the wiring to sensors, seatbelt pretensioners and airbags.

After an accident it stores crash data and locks itself. As a component of the safety system, it calls for particular care with every intervention.

Why does the control unit 89170-12K50 fail?

The 89170-12K50 most often fails because of crash data stored in its memory after an accident, even if no airbag fired. Conventional diagnostic technology cannot remove it. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes, for example from a weak battery or a jump start.

The crash data is recorded in the unit itself. Airbag24 removes it during the repair.

Aged components and cold solder joints gradually worsen the signal path.

Moisture and corrosion at plug connectors disturb the contact, and voltage spikes additionally load the electronics.

How can you tell that the 89170-12K50 is defective?

A defect on the 89170-12K50 first becomes visible as the airbag warning light in the instrument cluster, which lights up permanently or intermittently. Added to this may be an error message, a diagnostic tool that cannot establish a connection, and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not be reliably active.

The airbag warning light is the most important signal, because the unit reports the finding itself. If the connection to the diagnostic tool also fails, this may point to the control unit itself.

Take the error message in the instrument cluster seriously and have the finding clarified promptly.

Which vehicles is the 89170-12K50 fitted in?

The assignment shows the Toyota models for which this unit is intended. The 89170-12K50 is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

The vehicles at a glance:

• Toyota Corolla E170 (2013-2018)

Before removal, compare the part number on the label with this page. This only ensures that it is the correct unit. Also have the fault memory read out, because only it shows whether the unit is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-02C70, 89170-12180, 89170-12G10, 89170-12N50.

How does the repair of the 89170-12K50 work?

First the fault memory is read out and the log enclosed. Then the battery is disconnected and the 89170-12K50 removed, followed by the repair order online and the shipment.

This order is mandatory for safety reasons. Removal only takes place once reading out and disconnecting are complete. Then pack the unit well before you send it.

Airbag24 checks the control unit on the test bench, replaces defective components, removes the crash data and carries out a function test. This processing at Airbag24 usually takes 3–4 working days. After that your own unit is sent back to you.

Our repairs come with 2 years' statutory liability for defects.

The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.

How does the control unit 89170-12K50 get to Airbag24?

You send the 89170-12K50 in as a parcel, or alternatively book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

The printed repair order belongs in the parcel, and the unit needs shock-proof packaging.